US9091465B2 - Magnetocaloric heat generator - Google Patents
Magnetocaloric heat generator Download PDFInfo
- Publication number
- US9091465B2 US9091465B2 US13/255,583 US201013255583A US9091465B2 US 9091465 B2 US9091465 B2 US 9091465B2 US 201013255583 A US201013255583 A US 201013255583A US 9091465 B2 US9091465 B2 US 9091465B2
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- United States
- Prior art keywords
- magnetic
- heat transfer
- transfer fluid
- activation phase
- activation
- Prior art date
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- Expired - Fee Related, expires
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B21/00—Machines, plants or systems, using electric or magnetic effects
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2321/00—Details of machines, plants or systems, using electric or magnetic effects
- F25B2321/002—Details of machines, plants or systems, using electric or magnetic effects by using magneto-caloric effects
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
-
- Y02B30/66—
Definitions
- the present invention relates to a method for generating a heat flow from a magnetocaloric element, said magnetocaloric element consisting of at least one magnetocaloric material comprising a hot end associated with a hot chamber and a cold end associated with a cold chamber, said method consisting in magnetically and alternately activating and de-activating the magnetocaloric element and in circulating a heat transfer fluid through said magnetocaloric element alternately towards the hot chamber and the cold chamber in synchronisation with the magnetic activation and de-activation phases.
- the magnetocaloric heat generators operate according to the principle of the heat pump by withdrawing thermal energy from a so-called “cold” chamber or source and returning it, at a higher temperature, to a so-called “hot” chamber or source.
- the magnetocaloric effect is an intrinsic property of the magnetocaloric materials. It causes a reversible variation of their temperature when they are subjected to a magnetic field or when they are removed from this magnetic field, or when this field is suppressed or substantially reduced.
- magnetocaloric materials There are two types of magnetocaloric materials: the materials of the first type heat up by the effect of a magnetic field and cool down after removing this magnetic field and these of the second type, called “reverse magnetocaloric effect materials”, cool down by the effect of a magnetic field and heat up when this magnetic field is removed.
- magnetically activated shall be used to describe a magnetocaloric material that heats up, regardless of the presence or absence of a magnetic field. So, a magnetocaloric material of the first type will be magnetically activated when it will be subjected to a magnetic field and a reverse magnetocaloric effect material will be magnetically activated when it will be removed from this magnetic field. Likewise, a “magnetically de-activated” material is a material cooling down either because the magnetic field is suppressed in the case of the magnetocaloric materials of the first type, or because of the application of a magnetic field in the case of the reverse magnetocaloric effect materials.
- FIGS. 1A to 1D The operating principle of the magnetocaloric effect—known under the name AMR (Active Magnetocaloric Refrigerator)—is illustrated in the attached FIGS. 1A to 1D . It consists in circulating a heat transfer fluid between the two hot and cold ends of a magnetocaloric material MC in synchronisation with the magnetic activation (by means of permanent magnets A—see FIGS. 1B and 1C ) and the magnetic de-activation (see FIGS 1 A and 1 D) of said magnetocaloric material MC.
- the heat transfer fluid circulates towards the hot end during the magnetic activation of the material MC ( FIGS. 1B and 1C ), then towards the cold end during the magnetic de-activation of the material MC ( FIGS. 1A and 1D ).
- the displacement of the heat transfer fluid may be achieved by means of pistons P.
- the heat transfer fluid is intended for achieving a heat transfer with said magnetocaloric material MC and the two hot and cold ends are connected respectively to a hot chamber CH and to a cold chamber FR.
- the magnetocaloric material MC is porous or comprises passages that can be crossed by the heat transfer fluid, these passages connecting the volume of the cold chamber FR to the volume of the hot source CH, located on both sides of the magnetocaloric material MC.
- a heat generator using this operating principle of the magnetocaloric effect is intended for exchanging thermal energy with one or several external user circuits (heating, air conditioning, tempering, etc.), for example through a heat exchanger or not.
- magnetocaloric heat generators liable to supply several kilowatts, and this more specifically for mobile applications having generally high compactness requirements, or for reversible heat pumps requiring a temperature amplitude higher than 80 K. Furthermore, such generators should offer a coefficient of performance COP higher than 3.
- the mass of magnetocaloric material receives alternately and instantaneously a stock of “calories” or “frigories” that it then returns to the fluid during the alternation initiated by said switching.
- the power necessary for circulating the heat transfer fluid in the magnetocaloric material increases in accordance with the square of the ratio of the length of the magnetocaloric material to the hydraulic diameter of the fluid channels or passages.
- the conduction heat losses through the magnetocaloric material increase according to the reverse ratio of the square of the length of the magnetocaloric material. Since the circulation of the heat transfer fluid is the main power consumption source of a magnetocaloric heat generator, any degradation of this item directly affects the COP—at the denominator.
- the present invention aims to overcome the above-mentioned compromise by proposing a method that allows increasing the thermal power that passes in a magnetocaloric element, and thus the useful power of a magnetocaloric heat generator implementing this method, without loss of efficiency.
- the invention relates to a method for generating a thermal flow of the kind defined in the preamble, characterized in that it consists in reverting the direction of circulation of the heat transfer fluid during said magnetic activation and de-activation phases, said magnetic activation phase comprising an initial step during which the heat transfer fluid circulates in the opposite direction towards the cold chamber, followed by a preponderant step during which the heat transfer fluid circulates in the good direction towards the hot chamber, and said magnetic de-activation phase comprising an initial step during which the heat transfer fluid circulates in the opposite direction towards the hot chamber, followed by a preponderant step during which the heat transfer fluid circulates in the good direction towards the cold chamber.
- the method according to the invention thus implements a particular coupling between the magnetocaloric cycle and the oscillation of the fluid which, due to its specific characteristics, maximises the active “raising” heat flow in the above conditions, improving substantially the returned power (to reach a power density of the order of 0.5 to 1 kW/l).
- the internal losses linked with the frequency increase may be limited by reducing the length of the regenerator formed by the magnetocaloric element and even more the amplitude of oscillation of the heat transfer fluid passing through it in order to limit the fluidic head losses. It is thus suggested to circulate through the magnetocaloric element, at each magnetic alternation, a quantity of heat transfer fluid smaller than the quantity of fluid liable to be contained in said magnetocaloric element, so that a part of the heat transfer fluid contained in the magnetocaloric element is not renewed. The renewal rate of the heat transfer fluid in the magnetocaloric element is then lower than one.
- the method can so consist in circulating alternately, in one direction, and then in the other, a quantity of heat transfer fluid smaller than the quantity of heat transfer fluid that could be contained in said magnetocaloric element.
- the method may consist in determining a duration of the initial step of the magnetic activation and de-activation phases shorter than half of the duration of each of said magnetic activation and de-activation phases.
- the invention also relates to a magnetocaloric heat generator comprising at least one magnetocaloric element made of at least one magnetocaloric material comprising a hot end associated with a hot chamber and a cold end associated with a cold chamber, a means of magnetic activation and de-activation of said magnetocaloric material and means of circulation driving a heat transfer fluid through said magnetocaloric element alternately towards the hot chamber and the cold chamber in synchronisation with the magnetic activation and de-activation phases.
- This magnetocaloric heat generator is characterised in that it comprises a control unit for said heat transfer fluid circulation means arranged to reverse its direction of circulation during said magnetic activation and de-activation phases according to the method.
- FIGS. 1A to 1D represent schematically a magnetocaloric element in its different operating steps according to the known heat flow generation method
- FIGS. 2A to 2E represent schematically a magnetocaloric element in its different operating steps according to the method of the invention
- FIG. 3A is a diagram illustrating the evolution of the temperature of a drop of heat transfer fluid circulating in the magnetocaloric element of FIGS. 1A to 1D .
- FIG. 3B is a diagram similar to that of FIG. 3A relating to the method of the invention implemented in the magnetocaloric element of FIGS. 2A to 2E .
- FIGS. 2A to 2E represent schematically an elevation view of a magnetocaloric element 1 made up of one or several magnetocaloric materials 2 , for example made of superposed plates whose spacing defines circulation channels for the heat transfer fluid which is driven by means of circulation or circulator 8 .
- This magnetocaloric element 1 is crossed by a heat transfer fluid (according to the arrows) in synchronisation with the magnetic activation and de-activation phases of this magnetocaloric element 1 .
- These magnetic activation and de-activation phases are achieved with the help of a means 7 of magnetic activation and de-activation represented in the attached example as a permanent magnet in relative movement with respect to the magnetocaloric element.
- the invention is not limited to the use of permanent magnets. Any other device liable to produce a magnetic field may be used, such as for example a sequentially powered electromagnet.
- said magnetocaloric element 1 may be porous, so that its pores form open fluid passages. It may also be made in the form of a full block in which mini or micro channels are machined or it may be made up of an assembly of possibly grooved superposed plates, between which the heat transfer fluid can flow. This configuration corresponds to the represented one. Any other embodiment allowing the heat transfer fluid to pass through said magnetocaloric material 1 can, of course, be suitable.
- the method according to the invention consists in circulating heat transfer fluid alternately towards the cold chamber 6 , then towards the hot chamber 4 .
- This heat transfer fluid circulation is synchronised in a new way with respect to the magnetic activation and de-activation phases.
- the heat transfer fluid is circulated towards the hot chamber 4 when the magnetocaloric element 1 is magnetically activated (and heats up)—see FIGS. 1 B and 1 C—and towards the cold chamber 6 when the magnetocaloric element 1 is magnetically de-activated (and cools down)—see FIGS. 1A and 1D .
- the method according to the invention provides to impose a phase or time shift between the change of direction of circulation of the heat transfer fluid and the change of status (magnetically activated or de-activated) of the magnetocaloric element 1 .
- this phase shift leads to a delay in the change of direction of circulation of the heat transfer fluid with respect to the change of magnetic status of the magnetocaloric element.
- FIGS. 2B and 2D This shift is represented more specifically in FIGS. 2B and 2D .
- FIG. 2B represents the situation in which the heat transfer fluid still moves towards the cold chamber 6 while the cycle change already took place, so while the material is magnetically activated and heats up.
- FIG. 2D represents the opposite situation in which the fluid still is moving towards the hot chamber 4 while the cycle change already took place, so while the material is magnetically de-activated and cools down.
- this heat transfer fluid maintains its direction of circulation towards the cold chamber 6 ( FIG. 2B ) while the magnetocaloric element 1 has been meanwhile magnetically activated, then it circulates towards the hot chamber 4 , while the magnetocaloric element 1 remains magnetically activated ( FIG. 2C ). Then the magnetic de-activation phase of the magnetocaloric element 1 takes place, in which the heat transfer fluid also maintains, at the beginning (initial phase), the direction of circulation towards the hot chamber 4 ( FIG. 2D ) before changing its direction of circulation, while the magnetocaloric element 1 remains magnetically de-activated ( FIG. 2E ).
- the magnetic activation phase comprises an initial step during which the heat transfer fluid circulates in the opposite direction towards the cold chamber 6 and a preponderant step during which the heat transfer fluid circulates in the good, or normal direction towards the hot chamber 4
- the magnetic de-activation phase comprises an initial step during which the heat transfer fluid circulates in the opposite direction towards the hot chamber 4 and a preponderant step during which the heat transfer fluid circulates in the good, or normal direction towards the cold chamber 6 .
- this new method allows increasing significantly the area delimited by the closed curve representing the path of a drop of heat transfer fluid with respect to that of FIG. 3A , which is representative of the active heat flow and thus of the thermal power of the generator implementing such a method according to the invention.
- the diagrams of FIGS. 3A and 3B describe in fact the displacement of a drop of heat transfer fluid inside of one of the passages of the magnetocaloric element respectively according to the known method of FIGS. 1A to 1D and according to the method of the invention represented by FIGS. 2A to 2E .
- FIG. 3A illustrates the mechanism of the formation of the active heat flow raising the temperature gradient set up in the generator between the cold chamber FR and the hot chamber CH.
- the abscissa axis represents the distance x according to the length L of the magnetocaloric material or element MC and the ordinate axis represents the temperature.
- the cold source or chamber FR is located on the left of abscissa 0 and the hot source CH is located on the right of abscissa L.
- the heat transfer fluid is subjected to an oscillating linear movement of period ⁇ , and thus changes direction at every half period.
- the amplitude of the oscillation equal to the distance covered in each direction, is smaller than the length L of the magnetocaloric material MC, so that the abscissa axis represented in this diagram does not cover the whole length L of the magnetocaloric material MC.
- the magnetocaloric material has cooled down by ⁇ TMMC, represented by the distance between the two curves “Gradient T MMC Activated Initial” and “Gradient T MMC Activated Final”, while the drop of heat transfer fluid circulating in the passage facing it has been renewed and is now at a temperature above that of the initial drop of fluid, always according to the gradient of the generator.
- the second half period naturally shows the reverse variations.
- the active heat flow that “raises” the gradient may be assessed by comparing the energies exchanged on the left and on the right of the centre of symmetry of said closed curve.
- the first half period the temperature differences between the drop of fluid and the magnetocaloric material MC are larger on the left than on the right. Consequently, the drop of fluid receives more energy from the material MC on the left than on the right.
- the second half period the symmetrical temperature differences are larger on the right than on the left. When it returns, the drop of fluid gives more energy to the material MC on the right than on the left.
- the thermal energy of the drop of fluid is proportional to its temperature, in relation to its thermal capacity. So, the average energy transported by a drop of fluid during its path from the minimum abscissa to the maximum abscissa of its oscillation—counted positively—is proportional to the area subtended by the curve representing the temperature of the drop during this path up to the horizontal abscissa axis, referred to distance “a”.
- the power flow through the regenerator or magnetocaloric element is proportional to the area of the closed path of the drop in the plane of the diagram referred to distance “a”. It is positive—towards the hot source—if the drop describes the path clockwise, negative otherwise.
- the invention by achieving a phase shift between the change of the magnetic activation phase and the change of the circulation direction of the heat transfer fluid, the area of the closed path of the drop is increased, for the same quantity of magnetocaloric material, which leads to an increase of the thermal power of a heat generator implementing the method according to the invention.
- the duration of the phase shift which corresponds to the duration of the initial steps described above, shall be chosen in function of the heat exchange coefficient between the magnetocaloric element 1 and the heat transfer fluid. The higher this coefficient, the faster the temperature of the fluid reaches that of the magnetocaloric material after the magnetic alternation, and the smaller this phase shift can be, and conversely.
- the duration of the initial step of the magnetic activation and de-activation phases can be shorter than half the duration of each of the magnetic activation and de-activation phases.
- FIGS. 2A to 2E represent the heat generator according to the invention. It is of course intended for exchanging thermal energy with one or more external user circuits (heating, air conditioning, tempering, etc.) connected with at least one hot 4 or cold 5 chamber, possibly by means of a heat exchanger 4 ′, 6 ′ that may be integrated in each hot 4 or cold 5 chamber.
- one or more external user circuits heating, air conditioning, tempering, etc.
- a heat exchanger 4 ′, 6 ′ may be integrated in each hot 4 or cold 5 chamber.
- the method and the heat generator according to the invention can find an application, as well industrial as domestic, in the area of heating, air conditioning, tempering, cooling or others, at competitive costs and with reduced space requirements.
Abstract
Description
-
- the coefficient of performance (COP), which is the ratio of the returned thermal energy related to the consumed mechanical or electrical energy (in particular for circulating the fluid and actuating the magnetic and/or hydraulic switching devices), and
- the volumic power density (in kW/l), which characterises the size of the heart of the generator, that is to say the size of the magnetocaloric element, referred to the produced thermal power.
-
- At the moment t=0, the magnetocaloric material MC is activated. The position of the drop of heat transfer fluid in said material MC is shown by a first point, on the left of the diagram. It is at this time located at its minimum abscissa. The oriented curve that starts from the point represents the evolution of the temperature of the drop of fluid during its displacement in said material MC, until it returns at its starting point at time t=τ.
- Between t=0 and t=τ/2, the magnetocaloric material remains activated and transfers heat to the drop of heat transfer fluid. The temperature of the magnetocaloric material (T MMC) along the path of the drop of fluid follows the temperature gradient set up between the two hot and cold sources. It is represented by the straight line “Gradient T MMC Activated Initial”.
- At t=τ/2, the temperature of the magnetocaloric material along the path of the drop of fluid decreases because of the heat it transferred to the latter. It is represented by the straight line “Gradient T MMC Activated Final”.
-
- Att=τ/2, the magnetocaloric material is magnetically de-activated. Its temperature decreases instantly by ΔTMC, according to the gradient set up between the cold source and the hot source. It is represented by the straight line “Gradient T MMC Not Activated Initial”, parallel to the previous ones. It is now lower than that of the heat transfer fluid, so that the magnetocaloric material receives heat from the fluid up to τ. The drop of fluid is made to circulate in the opposite direction.
- At τ, the temperature of the magnetocaloric material increases again because of the heat it took from it. It is represented by the straight line “Gradient T MMC Not Activated Final”, still parallel to the previous ones. As previously, the curve “T MMC with respect to the drop of fluid” links both straight lines, joining the first at t=τ/2, on the right of the diagram, at the vertical of the maximum of the path of the drop, and the second at t=τ, on the left of the diagram, at the vertical of the minimum of said path.
- The magnetocaloric material is then re-activated, regaining ΔTMC, which restores the initial configuration of the cycle, at t=0.
Claims (10)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0951777A FR2943406B1 (en) | 2009-03-20 | 2009-03-20 | METHOD FOR GENERATING THERMAL FLOW FROM A MAGNETOCALORIC ELEMENT AND MAGNETOCALORIC THERMAL GENERATOR |
FR0951777 | 2009-03-20 | ||
FR09/51777 | 2009-03-20 | ||
PCT/FR2010/000228 WO2010106250A1 (en) | 2009-03-20 | 2010-03-18 | Method for generating a heat flow from a magnetocaloric element, and magnetocaloric heat generator |
Publications (2)
Publication Number | Publication Date |
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US20110315348A1 US20110315348A1 (en) | 2011-12-29 |
US9091465B2 true US9091465B2 (en) | 2015-07-28 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US13/255,583 Expired - Fee Related US9091465B2 (en) | 2009-03-20 | 2010-03-18 | Magnetocaloric heat generator |
Country Status (4)
Country | Link |
---|---|
US (1) | US9091465B2 (en) |
DE (1) | DE112010001217T5 (en) |
FR (1) | FR2943406B1 (en) |
WO (1) | WO2010106250A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5267689B2 (en) | 2011-04-26 | 2013-08-21 | 株式会社デンソー | Magnetic heat pump device |
JP2019086170A (en) * | 2017-11-01 | 2019-06-06 | 株式会社デンソー | Thermomagnetic cycle device |
JP2019086261A (en) * | 2017-11-09 | 2019-06-06 | 株式会社デンソー | Magnetic heat cycle device and its operation method |
Citations (15)
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US2589775A (en) * | 1948-10-12 | 1952-03-18 | Technical Assets Inc | Method and apparatus for refrigeration |
US3413814A (en) | 1966-03-03 | 1968-12-03 | Philips Corp | Method and apparatus for producing cold |
US4332135A (en) | 1981-01-27 | 1982-06-01 | The United States Of America As Respresented By The United States Department Of Energy | Active magnetic regenerator |
US4507928A (en) | 1984-03-09 | 1985-04-02 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Reciprocating magnetic refrigerator employing tandem porous matrices within a reciprocating displacer |
US5357756A (en) * | 1993-09-23 | 1994-10-25 | Martin Marietta Energy Systems, Inc. | Bipolar pulse field for magnetic refrigeration |
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US20070125095A1 (en) * | 2005-12-06 | 2007-06-07 | Hideo Iwasaki | Heat transporting apparatus |
US20070220901A1 (en) * | 2006-03-27 | 2007-09-27 | Kabushiki Kaisha Toshiba | Magnetic refrigeration material and magnetic refrigeration device |
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US20090217675A1 (en) * | 2008-03-03 | 2009-09-03 | Tadahiko Kobayashi | Magnetic refrigeration device and magnetic refrigeration system |
-
2009
- 2009-03-20 FR FR0951777A patent/FR2943406B1/en not_active Expired - Fee Related
-
2010
- 2010-03-18 WO PCT/FR2010/000228 patent/WO2010106250A1/en active Application Filing
- 2010-03-18 DE DE112010001217T patent/DE112010001217T5/en not_active Withdrawn
- 2010-03-18 US US13/255,583 patent/US9091465B2/en not_active Expired - Fee Related
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US2589775A (en) * | 1948-10-12 | 1952-03-18 | Technical Assets Inc | Method and apparatus for refrigeration |
US3413814A (en) | 1966-03-03 | 1968-12-03 | Philips Corp | Method and apparatus for producing cold |
US4332135A (en) | 1981-01-27 | 1982-06-01 | The United States Of America As Respresented By The United States Department Of Energy | Active magnetic regenerator |
US4507928A (en) | 1984-03-09 | 1985-04-02 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Reciprocating magnetic refrigerator employing tandem porous matrices within a reciprocating displacer |
US5357756A (en) * | 1993-09-23 | 1994-10-25 | Martin Marietta Energy Systems, Inc. | Bipolar pulse field for magnetic refrigeration |
EP1156287A1 (en) | 2000-05-18 | 2001-11-21 | Praxair Technology, Inc. | Magnetic refrigeration system with multicomponent refrigerant fluid forecooling |
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US20060144048A1 (en) * | 2003-07-07 | 2006-07-06 | Detlef Schulz | Method and device for converting heat into mechanical or electrical power |
EP1736717A1 (en) | 2005-06-20 | 2006-12-27 | Haute Ecole d'Ingénieurs et de Gestion du Canton | Continuously rotary magnetic refrigerator and heat pump and process for magnetic heating and/or cooling with such a refrigerator or heat pump |
US20070125095A1 (en) * | 2005-12-06 | 2007-06-07 | Hideo Iwasaki | Heat transporting apparatus |
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WO2008064776A1 (en) | 2006-12-01 | 2008-06-05 | Liebherr-Hausgeräte Ochsenhausen GmbH | Refrigerator and/or freezer |
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Also Published As
Publication number | Publication date |
---|---|
FR2943406B1 (en) | 2013-04-12 |
FR2943406A1 (en) | 2010-09-24 |
WO2010106250A1 (en) | 2010-09-23 |
DE112010001217T5 (en) | 2012-07-05 |
US20110315348A1 (en) | 2011-12-29 |
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